Reading resources from an Assembly

Hello.

I have a nice project with a resourcefile MyProject.resx

I add a string to the resource like this:

ResXResourceWriter reswriter = new ResXResourceWriter( "MyProject.resx");

reswriter.AddResource("myhappystring", "HaHaHaHaHa");
reswriter.Generate();
reswriter.Close();

Very nice. When I compile the project I can find the string in the dll binary code, so I assume it is in the assembly.

Now I want to get the string from the assembly...

Assembly theAssembly = Assembly.LoadFrom( "MyProject.dll" );

ResourceManager manager = new ResourceManager("MyProject", theAssembly);
manager.GetString("myhappystring");

This does not work...

Does anyone know how to get this string back out of my assembly?
Greets,
Arthur